Drying-furnace.



No. 858,260. PATENTED JUNE 25,1907.

' J. OAYGILL.

DRYING FURNAGE.

APPLIUATION FILED DEG-L 190,6.

2 SHEETS-SHEET 1.

511mm tor c7077]? away PATENTED JUNE 25, 190.7.

i J. OAYGILL.

- DRYING-FURNACE.

APPLICATION FILED DEQ- 1/1906.

2 SHEETS-SHEET 2- 3 4o chamber 8 and supports a grate 9 which rests UNITED STATES PATENT DRYlNG-FURNAGE.

Specificationof Letters Patent. I 7 Application filed December 1,1906. Serial No. 345,934.

l atent'ed June 25, 1907.

To all whom it may concern:

Be it known that I, JOHN CAYGILL, a citizen of the United States of America, residing at Wheeling, in the county of Ohio and State of West Virginia, have invented new and useful Improvements in- Drying-Furnaces, of which the following is a specification.

This invention relates to a drying furnace especially designed for drying out molds and 10 the like, the object of the invention being to provide an inexpensive and economically operating type of furnace adapted for the e ective generation of a heated current of air desi ned to be conducted to the mold or mol s to dry the interior thereof.

A further objectof the invention is to proyide a furnace having heating elements which may be convenientlyremoved when warped or otherwise injured, wherein provision is made for the ready removal of interiorparts of the furnace for repairs, and wherein a heated current of air is generated which is combined with the products of combustion from the fire box of thefurnace to form the drying current and. acts on its passage as a forcedr'a'ft to promote combustion in the fire box.

'In the accompanying drawings,Figure 1 plan view of the upper head. Fig. 4 is a perspective view of one of the'heating cells. Referring to the drawings, 1 designatesthe base of the furnace which forms the ash pit 2 and is provided with a clean-out door 3. and a horizontal supporting flange 4, on which rests the furnace body 5, which latter is provided at its lower end with a flange 6 restin on said flange 4 and .fastened thereto by olts or rivets 7. The body 5 forms the fire box or upon an inward extension of the flange 6 and rivets 15.

is provided with a brace bar 1O bearing a ainst the inner edges of. the flan es 4 and 6.

e body 5 is provided with a fire rick lining 11 and an outlet flue 12 having a suitable fireroof lining 12 and is closed at its upper end y a head 13 resting u on a supporting flange 14'at the upper on of the body and detachably secured thereto by bolts or The head 13 is provided onits under side i ss-l i upon thehead and embeddedinsaid material.

with a fire-proof lining 16, preferably comp osed of some suitable plastic material fixed to the head'by ribs or projections 17 formed The head is further provided. in its upper side with a series of pockets 18, each communicating with a assage or opening 19 leading downward t rough the head and lining 16 and normally communicating with the fire box 8. Fitting in these openings and projecting downwardly into the upper portion of the fire box are heating cells or chambers 20, conforming in size and diameter to the openings 19. and with flanges 21 seated in the pockets 18 and resting upon the bottom walls, thereof, whereby said cells are detachably fitted in the ockets and openings-and supported by the head. Preferably, a'oentral cell and an annular group of cells surrounding the same are employed, as shown in Fig. 3, this arrangement permitting of the use of a large number of cells in the space allowed and their disposition so as to be both effectively heated by the flames from the bed of fuel, but any other desired arrangement of the cells may be ado ted.

The ead is provided at its upper end with a flange 22 on which rests a hollow cover plate or cap 23 having a flange 24 to rest upon said flange 23 andldetacha'bly secured thereto by bolts or rivets 25. The cap 'or cover forms a superposed hotair chamber 26 communicating with the cells, and is .provided with an outlet 27 arranged above the opposite flue 25 of the fire box. Suitably supported by the cap is an air supply pipe 28, through which air, preferably under compression, is suppliedto the cells 20, the air being conducted from said pipe to the cells provided at their upper ends through conducting pipes 29. These pipes 4 connect at their upper ends with the pipe 28 and lead downward through the cap and hot 'air chamber into the cells. The pipes are of less diameter than the cells and terminate a suitable distance above the bottom of the latter, so that the air entering the cells therethrough will be heated and thence flow;up-

wardly out through the cells into the chamk ber 26. The cells are constructed of some;

quickly heated by the flames in the firebox and to heat the air in turn to a hi h degree. The furnace is provided with suitable fire and draft doors 30 and 31. a a

A discharge 'pipe or outlet connection 32 is suitable durable material adapted to be 7 arranged upon the exterior of the furnace and is coupled in any suitable manner to the outlets 12 and 27, and is suitably constructed at its lower end for connection with the mold or with a conductor leading to one or a series of molds.

It will be understood that the air enterin the cells through the pipes 29 will be heated by the heat of the and will thence pass upward into the chamber 26 and from the same into the discharge pipe 32, while the products of combustion from the furnace will discharge through the outlet 12 into thedischarge pipe. ed air on its downward passage through the pipe 32 will operate as a force-draft to induce and promote combustionof the fuel resti on the grate in the chamber 8, and will be met by and commingle with the products of combustion exhausting through the outlet 12, ,whereby the air will be heated to a higher degree of intensity. The resultant current of the drying fiuid will thence flow through the lower end of the pipe 32 to the mold or molds and, owing to its high de ree of temperature, will effect a rapid and efficient drying thereof.

Having tnus described the invention, what i is claimed as new, is

l. A drying furnace having a fire box pro- -vided with an outlet flue, a heatin chamber .heating chamber, air conductors leading to said vessels, and a discharge pipe connecting with said outlets.

2. A dryin furnace having a fire box with an outlet lea ing therefrom, an air heater arranged above the fire box and provided with an outlet, means for conductlng air to the heater, and a discharge pipe connected at.

its upper end with the air heater and below the same with the fire box outlet. 3. drying furnace having a fire box profiame within the fire box The heat- 1 vided .with an outlet, an air chamber above the same and also having an outlet, a series of heating cells closing communication between said fire box and chamber and projecting into the box and communicating with the chamber, and an'outlet flue connected with said outlet.

4. A furnace of the character described having a fire box, a head supported thereon and provided with openings, a cap carried by the head and forming an a1r' chamber, the fire box and air chamber being provided with outlets, heating cells su ported by the head and projecting into the e box, said cells being 1n communication at their upper ends with the air chamber, a source of air supply, conducting pipes leading therefrom to the air cells, and a downwardly extending discharge pipe communicating at its upper end with the outlet from the air chamber and beiow the same with the outlet from the fire 5. A drying furnace having a fire box provided with an outlet flue, a heating chamber arran ed above the fire box and separated therei rom by a partition, said chamber being provided with an outlet and the partition with openings, heating vessels fitted in said openings and projectmg into the fire box, said vessels being closed at their lower ends and open at their upper ends, means for supplying air to said vessels, and a discharge pipe communicating at its upper end with the outlet of the heating chamber and below the same with the flue inlet.

In testimony whereof, I aifix my signature in presence of two witnesses.

JOHN CAYGILL. Witnesses:

TnoMAs TAGUE, O. D. HIGGANS. 

